3 ms·
Fair enough, but your average t-shirt is also somewhere around SPF 10, leaving you almost completely exposed even when you feel fully clothed. It's like UV has
by powellc 16y ago
Fair enough, but your average t-shirt is also somewhere around SPF 10, leaving you almost completely exposed even when you feel fully clothed.
It's like UV has some sort of x-ray goggle-like ability...
- InclinedPlane 16y agoSPF means "sun protection factor". SPF 10 is not "completely exposed" it's actually a very high level of protection, it means that it will take 10x as much sun exposure to lead to the same amount of UV-B reaching your skin, more or less.
- kragen 16y agoSPF 10 is 90% covered, and cotton T-shirts are usually higher than that. You'll find that you can see visible light through a T-shirt at around a 10× reduction too.